Two wheel sets, one bike - best approach?Currently I'm with the 'changing tyres' solution, it's just that my tyres [Vittoria Rubino Pro Slick] & rims[DT Swiss 5.1D] are a right royal PIA to get on and off..! But I am getting better at it..!

Why does my rear derailleur keep breaking?The hanger is fine.. The bike is steel and after the first mech went the hanger was bent but got it straightened and mech replaced at my LBS. Just to emphasises, the mech was nowhere near the spokes..! :o|